engleski

THE INFLUENCE OF ELECTROINK PIGMENTATION ON THE QUALITY OF INDIRECT DIGITAL PRINTING

Indirect electrophotographic printing with the liquid toner is based on specially constructed ElectroInk. Somewhat better quality of prints is attributed to the tiny pigment particles which, when exposed to the visible light, result in expressive chromaticity. The star like shape ensures good bonding of the pigment and the printing substrate which results in a small and even ink coating. Prints with different pigmentation of ElectroInk were made for this work (inking density from 1, 20 to 2, 00). Different printing substrates were used in printing (Symbol = fine art paper, Arcoprint = natural paper, Splendogel = specially prepared paper for electrophotographic printing). Different concentrations of pigment quantity in ElectroInk influence differently the quality of the final print. Achieving of optimum, i.e. the high quality print on such printing substrates is possible to determine by electrophotographic measurements (CIE LAB ?E and space gamut) and by densitometric measurement (inking density and the value of the dot gain). The results show that the deviation of the space volume is the greatest on natural paper (Arcoprint = 11, 12%), fine art paper (Symbol = 7, 9%) and on specially coated paper (Splendogel = 5, 98%). The greatest space gamut is formed with the thickest ink (D=2, 0), where the expected increase of colour reproduction is not achieved. Gradual increase of inking density (from D = 1.20 to D=1.60) on Splendogel paper results in modest gamut increase of 9, 29%, while the other printing substrates react better (Arcoprint 40, 41%, Symbol 31, 29%). The average inking deviations of basic inks (?EMAX -?EMIN) are great (Symbol =12, 6, Splendogel =10, 6 and Arcoprint =10, 26). The screened and unscreened printing elements have identical changes.

Indirect electrophotography; ElectroInk Mark 3.1; reproduction gamut

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